“I regret what I did, I got into a lot of trouble and although it’s no excuse, I acted in the heat of the moment out of hurt and anger,” she said.

Donoghue was devastated when she found a pair of women’s pants and a sex toy under her boyfriend Wullie Crawford’s bed in April.

The UK mum of three — who had only given birth to the couple’s daughter six weeks previously — was then horrified to find graphic pictures and homemade sex videos of her 37-year-old partner romping with his teenage lover of 18 on his Facebook account.

Furious the dad of four had been cheating on her, Donoghue says she sent around six of the intimate images to friends in private messages on Facebook.

She also sent images to the girl’s mum and boyfriend along with the message: “Here’s your girlfriend.”

Heartbreaking ... Lorraine Donoghue discovered her boyfriend Wullie Crawford was cheating on her while she was pregnant. Picture: FacebookSource:Supplied

Now after escaping a prison sentence, Lorraine has spoken out to warn others — and told how she was hauled in front of the courts for trying to get back at her cheating ex.

“I couldn’t believe he would do this to me. When I realised she knew about me too and was happy to sleep with him behind my back when I was pregnant, it just left me speechless,” she said.

“There were loads of messages between him and her, even discussing what I’d found, and I knew then they had been sleeping together behind my back while I was pregnant for about a year.

“In a moment of madness and utter desperation and anger, I took some screen grabs and mailed them to people I knew. I even sent them to Wullie and the girl and although I knew it was really nasty, I sent some to her mum and her boyfriend so they could see her and what she was doing.”